빗물활용 벽면녹화 용기 내 유기질비료 배합비에 따른 노랑조팝나무의 생육 반응

Abstract

본 연구는 용기형 벽면녹화에서 유기질비료의 비율에 따른 노랑조팝나무의 생육을 실험적으로 평가함으로써, 빗물활용을 위한 적합한 식재지반 조성과 벽면녹화 수종으로서 관목류의 활용성을 높이고자 하며, 그 결과는 다음과 같다. 1. 6월 무강수 실험기간 동안 용기형 벽면녹화 식재지반 내 토양수분함량을 중량단위로 측정한 결과, <TEX>$A_1L_1$</TEX> > <TEX>$A_2L_1$</TEX> > <TEX>$A_4L_1$</TEX> > <TEX>$A_8L_1$</TEX> > <TEX>$A_1L_0$</TEX> 순으로, 유기질비료의 비율이 높을수록 완만하게 감소하였다. 2. 유기질비료 배합비율에 따른 노랑조팝나무의 생육은 대조구인 <TEX>$A_1L_0$</TEX>과 비교해 볼 때, 실험구별 생육 차이는 확연하지 않았으나 <TEX>$A_2L_1$</TEX>이 전체 처리구 중 가장 양호한 생육상태를 보였다. 3. 생존율은 대조구인 <TEX>$A_1L_0$</TEX>에서 모든 식물이 고사한 반면, 유기질비료 비율이 높을수록 생존율은 향상되었다. 이러한 실험적 결과를 통해, 빗물활용 용기형 벽면녹화에서 유기질비료는 노랑조팝나무의 생육보다는 생존을 향상시키는 것으로 나타나, 빗물만으로 물공급이 이루어지는 벽면녹화에 건조기를 대비할 수 있는 녹화방안이라 본다. 또한 이와 더불어 식재지반 내 토양수분함량을 높이기 위한 토양개량제나 빗물저류시스템의 연계가 고려된다면 노랑조팝나무는 용기형 벽면녹화에 활용가능성이 높은 관목이라 판단된다. For evaluating the effect of various organic fertilizer ratios on the Spiraea<TEX>${\times}$</TEX>bumalda 'Gold Mound' growth, a container green wall system experiment was conducted in a greenhouse at Konkuk university. The experimental planting grounds were prepared with different organic fertilizer ratios (<TEX>$A_1L_0$</TEX>, <TEX>$A_8L_1$</TEX>, <TEX>$A_4L_1$</TEX> <TEX>$A_2L_1$</TEX> and <TEX>$A_1L_1$</TEX>) and with drought tolerance and an ornamental value Spiraea<TEX>${\times}$</TEX>bumalda 'Gold Mound' was planted. The change in soil moisture contents, plant height, number of branches, number of dead leafs, number of leaf, number of shoots, length of node, length of leaf, width of leaf, root-collar caliper, chlorophyll contents and survival rate were investigated from April to Jun 2010. 1. The result of soil moisture contents was analyzed with weight unit in the container green wall system during the dry summer season. The soil moisture contents were significantly enhanced in the container green wall system in increasing order as the amount of fertilizer level increased <TEX>$A_1L_1$</TEX> > <TEX>$A_2L_1$</TEX> > <TEX>$A_4L_1$</TEX> > <TEX>$A_8L_1$</TEX> > <TEX>$A_1L_0$</TEX>. 2. Compared to the control treatment (amended soil with 100% + organic fertilizer 0%) application, the highest plant growth was observed in the treatment of <TEX>$A_2L_1$</TEX>(amended soil with 67% + organic fertilizer 13%) application. However, the differences between the organic fertilizer ratio treatments of <TEX>$A_1L_1$</TEX>, <TEX>$A_4L_1$</TEX>, <TEX>$A_8L_1$</TEX>, and the <TEX>$A_1L_0$</TEX> organic fertilizer application were mostly not significant. 3. The survival rate increased with the increasing application of organic fertilizer, but in the control treatment (amended soil with 100% + organic fertilizer 0%) application all the plants died. Experimental results from the presented study clearly demonstrated that the organic fertilizer improved the survival rate more than the Spiraea<TEX>${\times}$</TEX>bumalda 'Gold Mound' growth at different levels of organic fertilizers. This strain can be utilized as a plant growth application in living wall systems during the dry summer season. Therefore, Spiraea<TEX>${\times}$</TEX>bumalda 'Gold Mound' is expected to be a highly valuable shrub for the green wall system if it should be considered in integration with stormwater retention or as a soil conditioner for increasing soil water contents in planting ground.